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Fast reduction of Cr(VI) from aqueous solutions using alumina
Fabiola Glorias-Garcia,Jose´ Miguel Arriaga-Merced,Gabriela Roa-Morales,Vı´ctor Varela-Guerrero,Carlos Eduardo Barrera-Dı´az,Bryan Bilyeu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Hexavalent chromium is challenging to remove from industrial wastewater due the solubility and anionic nature of the chromates. Cr(VI) is typically removed by reduction to Cr(III), then precipitation or adsorption, which requires multiple steps and bulk reagents and generates sludge. In this project, we have evaluated a sintered alumina disk as a single step sorbent for Cr(VI). The disk was porous enough that 20 mL samples passed through in about 3 s using light suction. A single pass through the disk only reduced the [Cr(VI)] by 10–20%, but by passing the solution through the disk five times up to 80% was removed in samples up to 130 mg/L and up to around 50% for much higher concentrations. The five passes through the filter disk took less than a minute. On each pass through the disk the characteristic chromate UV–vis absorbance decreased, the Cr(VI) concentration (by the diphenylcarbazide method) decreased, and the pH rose slightly. The XRD pattern showed no change in the crystal structure of the alumina, but the SEM/EDS identified chromium on the surface. In addition to confirming chromium on the surface of the alumina, the XPS spectra showed a change in the binding energy of the aluminum, which is consistent with complexation. The system was fast and effective (in series), so should be applicable to industrial wastewater treatment.
Emulsion templated vesicles with symmetric or asymmetric membranes
Huang, Yuting,Kim, Shin-Hyun,Arriaga, Laura R. Elsevier 2017 Advances in colloid and interface science Vol.247 No.-
<P><B>Abstract</B></P> <P>Emulsion droplets with well-controlled topologies are used as templates for forming vesicles with either symmetric or asymmetric membranes. This review summarizes the available technology to produce these templates, the strategies and critical parameters involved in the transformation of emulsion droplets into vesicles, and the properties of the generated vesicles, with a special focus on the composition and material distribution of the vesicle membrane. Here, we also address limitations in the field and point to future fundamental and applied research in the area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Production of vesicles from emulsion drops with controlled topologies </LI> <LI> Fabrication of emulsion drops by microfluidic technologies </LI> <LI> Generation of unilamellar or multilamellar vesicles with symmetric or asymmetric membranes </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
María Del Rocío Bonilla,José Luis del Olmo Arriaga,David Andreu 한국마케팅과학회 2019 Journal of Global Fashion Marketing Vol.10 No.4
The aim of this study is to analyse the interactions between fashion brands and their followers on social networks, focusing on empirically determining the relationship established between the fast fashion company H&M and its users on the social network Instagram. This analysis focuses on determining the type of post that generates greater engagement for the company’s Instagram account. Therefore, a classification and subsequent statistical treatment of the content of the posts of this account was carried out throughout 2017. Three categorization systems were used for this analysis in order to determine engagement from the point of view of the content of the message, the company’s communication strategy, and formal aspects and product category presented in the post. To date, research on the interaction of fashion brands with users on social networks has focused primarily on other platforms of social interaction other than Instagram. In contrast, this study makes an important contribution to research on the interaction of a fast fashion brand with users of the most specialized social network in this sector.
Enrique Rocha-Rangel,Juan López-Hernández,José A. Rodríguez-García,Eddie N. Armendáriz-Mireles,Carlos A. Calles-Arriaga,W. J. Pech-Rodríguez,José A. Castillo-Robles 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.8
In this work, strontium titanate samples were prepared starting from SrCO3 and TiO2 powders mixture. Raw materials wereactivated mechanically in a planetary mill and then calcined at different temperatures (900 to 1300 oC). Powders after grindingwere analyzed by differential thermal analysis in order to follow the carbonate decomposition. On the other hand, samplesresulting from heat treatment were characterized by XRD, SEM and electrical measurements. XRD analysis determines thatSrTiO3 synthetized presents the cubic structure of perovskite. Complete reaction for SrTiO3 compound formation occurs at1200 oC. SEM observations indicate the presence of a microstructure with very small gran size and consequently a largenumber of grain boundaries. Electrical measurements suggest the formation of a material with high insulating capacity. Withthis evidence, it can be concluded that solid state reactions activated mechanically, proved to be an effective way to fabricatestrontium titanate compound with very fine microstructure and high insulating behavior.
M. Galindo-Mentle,F. López-Huerta,R. Palomino-Merino,C. Zúñiga-Islas,W. Calleja-Arriaga,A. L. Herrera-May 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
We present a fabrication process of microstructures using both boron-doped hydrogenated amorphous silicon and hydrogenated amorphoussilicon-germanium (a-SiB:H and a-Si0.5Ge0.5B:H) films for applications in devices based on microelectromechanical systems(MEMS). These microstructures are fabricated through plasma enhanced chemical vapor deposition (PECVD) with a low temperature of300°C at 110 kHz and a pressure of 0.6 Torr. The proposed microstructures have three different geometries (Diamond, cantilever andbridge) considering a single structural layer of 1 μm thickness and are fabricated using surface micromachining. The fabricated a-Si0.5Ge0.5B:H microstructures do not present sticking problems and have good mechanical stability, which can allow their use in MEMSdevices. Our fabrication process with hydrogenated amorphous SiGe films is simple. This process decreases the residual stress of themicrostructures and allows the metal deposition on the microstructures surfaces.
Distinct functions of Ulk1 and Ulk2 in the regulation of lipid metabolism in adipocytes.
Ro, Seung-Hyun,Jung, Chang Hwa,Hahn, Wendy S,Xu, Xin,Kim, Young-Mi,Yun, Young Sung,Park, Ji-Man,Kim, Kwan Hyun,Seo, Minchul,Ha, Tae-Youl,Arriaga, Edgar A,Bernlohr, David A,Kim, Do-Hyung Landes Bioscience 2013 Autophagy Vol.9 No.12
<P>ULK1 (unc-51 like kinase 1) is a serine/threonine protein kinase that plays a key role in regulating the induction of autophagy. Recent studies using autophagy-defective mouse models, such as atg5- or atg7-deficient mice, revealed an important function of autophagy in adipocyte differentiation. Suppression of adipogenesis in autophagy-defective conditions has made it difficult to study the roles of autophagy in metabolism of differentiated adipocytes. In this study, we established autophagy defective-differentiated 3T3-L1 adipocytes, and investigated the roles of Ulk1 and its close homolog Ulk2 in lipid and glucose metabolism using the established adipocytes. Through knockdown approaches, we determined that Ulk1 and Ulk2 are important for basal and MTORC1 inhibition-induced autophagy, basal lipolysis, and mitochondrial respiration. However, unlike other autophagy genes (Atg5, Atg13, Rb1cc1/Fip200, and Becn1) Ulk1 was dispensable for adipogenesis without affecting the expression of CCAAT/enhancer binding protein ? (CEBPA) and peroxisome proliferation-activated receptor gamma (PPARG). Ulk1 knockdown reduced fatty acid oxidation and enhanced fatty acid uptake, the metabolic changes that could contribute to adipogenesis, whereas Ulk2 knockdown had opposing effects. We also found that the expression levels of insulin receptor (INSR), insulin receptor substrate 1 (IRS1), and glucose transporter 4 (SLC2A4/GLUT4) were increased in Ulk1-silenced adipocytes, which was accompanied by upregulation of insulin-stimulated glucose uptake. These results suggest that ULK1, albeit its important autophagic role, regulates lipid metabolism and glucose uptake in adipocytes distinctly from other autophagy proteins.</P>